Add more linters to improve code readability (#19989)

Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)

services/auth/sspi_windows.go

@@ -180,7 +180,7 @@ func (s *SSPI) shouldAuthenticate(req *http.Request) (shouldAuth bool) {
 	} else if middleware.IsAPIPath(req) || isAttachmentDownload(req) {
 		shouldAuth = true
 	}
-	return
+	return shouldAuth
 }
 
 // newUser creates a new user object for the purpose of automatic registration